Pharmaceutical composition for modified release

ABSTRACT

A pharmaceutical composition for modified release, comprising (1) (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide, or a pharmaceutically acceptable salt thereof, (2) at least one additive which ensures penetration of water into the pharmaceutical composition and which has a solubility such that the volume of water required for dissolving 1 g of the additive is 5 mL or less, and (3) a hydrogel-forming polymer having an average molecular weight of approximately 100,000 or more, or a viscosity of 12 mPa·s or more at a 5% aqueous solution at 25° C. is disclosed.

TECHNICAL FIELD

The present invention relates to a pharmaceutical composition for modified release capable of reducing food effects, which are observed in conventional tablets, by combining an active ingredient with specific ingredients to control a releasing rate of the active ingredient.

More particularly, the present invention relates to a pharmaceutical composition comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, an additive which ensures penetration of water into the pharmaceutical composition, and a polymer which forms a hydrogel, in which the changes in AUC and Cmax caused by the intake of food can be decreased by controlling a releasing rate of the active ingredient.

BACKGROUND ART

(R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide dihydrochloride has been created by Astellas Pharma Inc., and it has been reported that this compound has not only both an activity of promoting insulin secretion and an activity of enhancing insulin sensitivity, but also an antiobestic activity and an antihyperlipemic activity based on an activity of selectively stimulating a β3 receptor, and is useful in treating diabetes (see, for example, patent literature 1).

Further, it has been reported that the compound can be used as a therapeutic agent for overactive bladder, such as overactive bladder accompanied by prostatic hyperplasia, or overactive bladder accompanied by urinary urgency, urinary incontinence, and urinary frequency (see, for example, patent literature 2).

A clinical trial of (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide in the form of conventional formulations revealed disadvantages, for example, that pharmacokinetic data unexpectedly varied according to the presence or absence of the intake of food (not published). For example, Cmax in a fed state was remarkably decreased to 33%, and AUC in the fed state was remarkably decreased to 53%, in comparison with those in a fasted state. In this case, Cmax in the fasted state was three times higher than that in the fed state. These problems are considered to be raised by, for example, the changes in pharmacokinetics caused by food, and therefore, the development of a formulation capable of avoiding the effects by food intake is desired.

-   [patent literature 1] International Publication No. WO 99/20607     (Example 41) -   [patent literature 2] International Publication No. WO 2004/041276

SUMMARY OF INVENTION Technical Problem

An object of the present invention is to provide a pharmaceutical composition for modified release comprising (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide or a pharmaceutically acceptable salt thereof, in which the pharmaceutical composition has efficacy the same as or higher than those of conventional formulations and has no limitations on food intake, and a process of manufacturing the pharmaceutical composition.

Solution to Problem

The elimination half-life (T_(1/2)) of (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide is long (approximately 18 to 24 hours), and thus, a formulation thereof for modified release is not necessarily needed. Taking into consideration the results of the clinical trial described above, the present inventors conducted intensive studies to design the formulation by paying attention to the control of a release rate of the drug from a formulation to the extent that the release is not affected by food intake or the like, rather than the addition of release control.

On the basis of blood concentration profiles (in a fasted state/after the intake of food) after administration of a conventional formulation (rapid release formulation), the absorption rate of the drug in a fed state was calculated by a deconvolution method to predict continuous absorption for about 4 hours. The present inventors considered from this result that a formulation capable of continuous drug release for 4 hours or more would be able to reduce the effects by food, because the drug release from the formulation would become the rate-limiting step for absorption.

The present inventors carried out a clinical trial in human using three types of formulations in which the release rate of the drug was controlled (Time when the release percentage of the drug from the unit formulation was 80% (T80%)=4 hr, 6 hr, and 10 hr), and found that all formulations could reduce the effects by food, to complete the present invention.

It is generally known that the retention time in the stomach and the release rate of formulations for modified release vary according to the presence or absence of food intake, and as a result, there is a possibility that blood concentration profiles is changed. However, surprisingly, when using this formulation, the change of the blood concentration profiles was small in the presence or absence of food intake.

The present invention is characterized by providing a pharmaceutical composition for modified release which is not affected by the effects of food intake and exhibits a decreased change in AUC or Cmax.

The present invention provides:

-   [1] a pharmaceutical composition for modified release,     comprising (1)     (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic     acid anilide, or a pharmaceutically acceptable salt thereof, (2) at     least one additive which ensures penetration of water into the     pharmaceutical composition and which has a solubility such that the     volume of water required for dissolving 1 g of the additive is 5 mL     or less, and (3) a hydrogel-forming polymer having an average     molecular weight of approximately 100,000 or more, or a viscosity of     12 mPa·s or more at a 5% aqueous solution at 25° C.; -   [2] the pharmaceutical composition for modified release of [1],     wherein the additive which ensures penetration of water into the     pharmaceutical composition is one compound, or two or more compounds     selected from the group consisting of polyethylene glycol,     polyvinylpyrrolidone, D-sorbitol, xylitol, sucrose, anhydrous     maltose, D-fructose, dextran, glucose, polyoxyethylene     polyoxypropylene glycol, sodium chloride, magnesium chloride, citric     acid, tartaric acid, glycine, β-alanine, lysine hydrochloride, and     meglumine; -   [3] the pharmaceutical composition for modified release of [2],     wherein the additive which ensures penetration of water into the     pharmaceutical composition is one compound, or two or more compounds     selected from the group consisting of polyethylene glycol,     polyvinylpyrrolidone, sucrose, and sodium chloride; -   [4] the pharmaceutical composition for modified release of any one     of [1] to [3], wherein an amount of the additive which ensures     penetration of water into the pharmaceutical composition is 5% by     weight to 70% by weight with respect to the total weight of the     pharmaceutical composition; -   [5] the pharmaceutical composition for modified release of [4],     wherein an amount of the additive which ensures penetration of water     into the pharmaceutical composition is 20% by weight to 60% by     weight with respect to the total weight of the pharmaceutical     composition; -   [6] the pharmaceutical composition for modified release of any one     of [1] to [5], wherein the hydrogel-forming polymer is one compound,     or two or more compounds selected from the group consisting of     polyethylene oxide, hydoxypropyl methylcellulose, hydroxypropyl     cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose,     and a carboxyvinyl polymer; -   [7] the pharmaceutical composition for modified release of [6],     wherein the hydrogel-forming polymer is one compound, or two or more     compounds selected from the group consisting of polyethylene oxide,     hydoxypropyl methylcellulose, and hydroxypropyl cellulose; -   [8] the pharmaceutical composition for modified release of any one     of [1] to [7], wherein an amount of the hydrogel-forming polymer is     5% by weight to 70% by weight with respect to the total weight of     the pharmaceutical composition; -   [9] the pharmaceutical composition for modified release of any one     of [1] to [8], further comprising an antioxidant; -   [10] the pharmaceutical composition for modified release of [9],     wherein the antioxidant is one compound, or two or more compounds     selected from the group consisting of butyl hydroxytoluene, sodium     ascorbate, and propyl gallate; -   [11] the pharmaceutical composition for modified release of claim     10, wherein the antioxidant is butyl hydroxytoluene; -   [12] the pharmaceutical composition for modified release of any one     of [9] to [11], wherein an amount of the antioxidant is 0.025% by     weight to 0.25% by weight; -   [13] the pharmaceutical composition for modified release of any one     of [1] to [12], further comprising a stabilizer; -   [14] the pharmaceutical composition for modified release of [13],     wherein the stabilizer is one compound, or two or more compounds     selected from the group consisting of yellow ferric oxide, red     ferric oxide, and black iron oxide; -   [15] the pharmaceutical composition for modified release of [14],     wherein the stabilizer is yellow ferric oxide and/or red ferric     oxide; -   [16] the pharmaceutical composition for modified release of any one     of [13] to [15], wherein an amount of the stabilizer is 0.05% by     weight to 1% by weight; -   [17] a process of manufacturing a pharmaceutical composition for     modified release, characterized by comprising mixing (1)     (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic     acid anilide, or a pharmaceutically acceptable salt thereof with (2)     at least one additive which ensures penetration of water into the     pharmaceutical composition and which has a solubility such that the     volume of water required for dissolving 1 g of the additive is 5 mL     or less and (3) a hydrogel-forming polymer having an average     molecular weight of approximately 100,000 or more, or a viscosity of     12 mPa·s or more at a 5% aqueous solution at 25° C., wherein an     amount of the additive is 5% by weight to 70% by weight with respect     to the total weight of the pharmaceutical composition, and an amount     of the hydrogel-forming polymer is 5% by weight to 70% by weight     with respect to the total weight of the pharmaceutical composition; -   [18] the process of [17], wherein the additive which ensures     penetration of water into the pharmaceutical composition is one     compound, or two or more compounds selected from the group     consisting of polyethylene glycol, polyvinylpyrrolidone, D-sorbitol,     xylitol, sucrose, anhydrous maltose, D-fructose, dextran, glucose,     polyoxyethylene polyoxypropylene glycol, sodium chloride, magnesium     chloride, citric acid, tartaric acid, glycine, β-alanine, lysine     hydrochloride, and meglumine; and -   [19] the process of [17] or [18], wherein the hydrogel-forming     polymer is one compound, or two or more compounds selected from the     group consisting of polyethylene oxide, hydoxypropyl     methylcellulose, hydroxypropyl cellulose, carboxymethyl cellulose     sodium, hydroxyethyl cellulose, and a carboxyvinyl polymer.

As formulation techniques for reducing or avoiding the changes in pharmacokinetics such as AUC or Cmax accompanied by food intake, a formulation technique concerning a sustained-release pharmaceutical composition containing tamsulosin hydrochloride is disclosed (see Japanese Unexamined Patent Publication (Kokai) No. 2005-162736 and Japanese Unexamined Patent Publication (Kokai) No. 2005-162737). This formulation technique is limited to tamsulosin, and applied to a formulation containing the drug at a low dose (0.4 mg per unit formulation). This formulation enables to control the release of tamsulosin therefrom by being mainly composed of a sustained-release base. By contrast, the pharmaceutical composition contains the drug at a high dose (i.e., high content per unit formulation), and it is considered difficult to control the release rate of the drug from a formulation containing the sustained-release base at a low content, and therefore, the present invention is technically quite different from the formulation disclosed in these references.

Effects of Invention

According to the present invention, a pharmaceutical composition for modified release which has no limitations on food intake and is stable (for example, reduction of changes in a sequential dissolution profile) can be provided.

Further, a pharmaceutical composition for modified release in which AUC is not reduced can be provided.

With respect to a conventional formulation, Cmax in the fed state was decreased by 33% in comparison with that in a fasted state. By contrast, with respect to the pharmaceutical composition for modified release of the present invention, Cmax in the fed state was 58% in comparison with that in a fasted state, and this result showed that reduction of Cmax caused by food intake could be significantly alleviated by forming its formulation into the pharmaceutical formulation for modified release.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a graph showing dissolution profiles of the pharmaceutical composition for modified release prepared in Example 11, and the time courses thereof.

DESCRIPTION OF EMBODIMENTS

The pharmaceutical composition for modified release of the present invention will be explained hereinafter.

The term “rapid release formulation (conventional formulation)” as used herein means a formulation in which the dissolution rate of the drug from the formulation is 85% or more after 30 minutes from the beginning a dissolution test, which is carried out in accordance with a dissolution test (paddle method) described in the United States Pharmacopoeia under the conditions that 900 mL of an appropriate test fluid (a USP buffer, pH 6.8) is used and the paddle rotation speed is 100 rpm. Alternatively, the term means a formulation in which the dissolution rate of the drug from the formulation is 85% or more after 30 minutes from the beginning a dissolution test, which is carried out in accordance with a dissolution test, method 2 described in the Japanese Pharmacopoeia under the conditions that 900 mL of a test fluid (a Mc. Ilvain buffer, pH 6.8) is used and the paddle rotation speed is 50 rpm.

The term “pharmaceutical composition for modified release” as used herein means a formulation in which the dissolution rate of the drug from the formulation is less than 85% after 30 minutes from the beginning a dissolution test carried out under the above conditions, and the drug release is controlled to the extent that the effects by food are reduced. More particularly, it is a formulation in which a hydrophilic base is combined with a polymer which forms a hydrogel.

The wording “the effects by food are reduced” as used herein means, for example, a 10% reduction, a 20% reduction in another embodiment, and a 30% reduction in still another embodiment, in comparison with Cmax of a conventional formulation. Alternatively, the term means, for example, a 10% reduction with respect to the decrease of Cmax in administration after food intake, in comparison with Cmax in administration in the fasted state, a 20% reduction in another embodiment, and a 30% reduction in still another embodiment.

The term “formulation in which the effects by food are reduced” as used herein means a formulation in which the dissolution rate of the drug from the formulation is 75% or less after 1.5 hours and 100% or less after 4 hours from the beginning a dissolution test, which is carried out under the above conditions [in accordance with a dissolution test (paddle method) described in the United States Pharmacopoeia under the conditions that 900 mL of an appropriate test fluid (a USP buffer, pH 6.8) is used and the paddle rotation speed is 50 to 200 rpm].

(R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide (hereinafter sometimes referred to as compound A) is represented by the following structural formula.

Compound A may be used in a free form which is not a salt, and may form a salt with an acid in other embodiments. Examples of such a salt include an acid addition salt with a mineral acid such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, or the like; and an acid addition salt with an organic acid such as formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, succinic acid, fumaric acid, maleic acid, lactic acid, malic acid, citric acid, tartaric acid, carbonic acid, picric acid, methanesulfonic acid, ethanesulfonic acid, glutamic acid, or the like. A hydrochloride may be used in another embodiment.

The dose of compound A may be appropriately selected in accordance with symptom, age, sex, and the like of the patient to be treated. The daily dose of compound A for oral administration to an adult is generally 0.01 to 100 mg/kg, which is administered once or divided into two to four doses per day.

The content of compound A per formulation is, for example, 1% by weight to 70% by weight, and 5% by weight to 50% by weight in another embodiment.

It is necessary that the hydrogel-forming polymer used in the present invention has properties, such as viscosity and the like at the time of gelling, that maintain the form of the almost completely gelled formulation against the motility of the digestive tract accompanied by food digestion, and migrate the gelled formulation to the colon in the lower digestive tract while maintaining the shape to a certain extent.

The molecular weight of the hydrogel-forming polymer is, for example, 100,000 or more, 100,000 to 8,000,000 in another embodiment, 100,000 to 5,000,000 in still another embodiment, and 100,000 to 2,000,000 in still another embodiment. The viscosity of the hydrogel-forming polymer is, for example, 12 mPa·s or more in a 5% aqueous solution at 25° C.; 12 mPa·s or more in a 5% aqueous solution at 25° C., and 40,000 mPa·s or less in a 1% aqueous solution at 25° C. in another embodiment; 400 mPa·s or more, and 7,500 mPa·s or less in still another embodiment; and 400 mPa·s or more, and 5,500 mPa·s or less in still another embodiment.

In the pharmaceutical composition for modified release of the present invention, the release period of time of the drug from the formulation can be arbitrarily controlled by adjusting the viscosity of the hydrophilic polymer which is used as a base that allows water to penetrate into the formulation.

The hydrogel-forming polymer used in the present invention is not particularly limited, so long as the release of the drug can be controlled to the extend that the effects of food on compound A may be reduced. Examples of the hydrogel-forming polymer include polyethylene oxide, hydroxypropyl methylcellulose, hydroxypropyl cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose, and carboxyvinyl polymers.

Examples of polyethylene oxide (hereinafter sometimes referred to as PEO) include product names, Polyox WSR-308 [average molecular weight: 8,000,000, viscosity: 10,000-15,000 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-303 [average molecular weight: 7,000,000, viscosity: 7,500-10,000 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR Coagulant [average molecular weight: 5,000,000, viscosity: 5,500-7,500 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-301 [average molecular weight: 4,000,000, viscosity: 1,650-5,500 mPa·s (1% aqueous solution at 25° C.)], Polyox WSR-N-60K [average molecular weight: 2,000,000, viscosity: 2,000-4,000 mPa·s (2% aqueous solution at 25° C.)], Polyox WSR-N-12K [average molecular weight: 1,000,000, viscosity: 400-800 mPa·s (2% aqueous solution at 25° C.)], Polyox WSR-1105 [average molecular weight: 900,000, viscosity: 8,800-17,600 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-205 [average molecular weight: 600,000, viscosity: 4,500-8,800 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-N-750 [average molecular weight: 300,000, viscosity: 600-1200 mPa·s (5% aqueous solution at 25° C.)], Polyox WSR-N-80 [average molecular weight: 200,000, viscosity: 55-90 mPa·s (5% aqueous solution at 25° C.)], and Polyox WSR-N-10 [average molecular weight: 100,000, viscosity: 12-50 mPa·s (5% aqueous solution at 25° C.)] (DOW).

Examples of hydoxypropyl methylcellulose (hereinafter sometimes referred to as HPMC) include product name Metolose 90SH50000 [viscosity in a 2% by weight aqueous solution at 20° C.: 2,900-3,900 mPa·s], Metolose SB-4 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4 mPa·S), TC-5RW (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 6 mPa·S), TC-5S (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 15 mPa·S), TC-5R (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 6 mPa·S), TC-5M (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4.5 mPa·S), TC-5E (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 3 mPa·S), Metolose 60SH-50 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 50 mPa·s), Metolose 65SH-50 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 50 mPa·s), Metolose 90SH-100 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 100 mPa·s), Metolose 90SH-100SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 100 mPa·s), Metolose 65SH-400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 400 mPa·s), Metolose 90SH-400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 400 mPa·s), Metolose 65SH-1500 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 1,500 mPa·s), Metolose 60SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 65SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-4000SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4,000 mPa·s), Metolose 90SH-15000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 15,000 mPa·s), Metolose 90SH-15000SR (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 15,000 mPa·s), and Metolose 90SH-30000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 30,000 mPa·s).

Examples of hydroxypropyl cellulose (hereinafter sometimes referred to as HPC) include HPC-SSL (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: 2.0-2.9 mPa·S), HPC-SL (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: 3.0-5.9 mPa·S), HPC-L (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: 6.0-10.0 mPa·S), HPC-M (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: 150-400 mPa·S), and HPC-H (product name, Nippon Soda Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: 1,000-4,000 mPa·S).

Examples of methylcellulose (hereinafter sometimes referred to as MC) include Metolose SM15 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 15 mPa·S), Metolose SM25 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 25 mPa·S), Metolose SM100 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 100 mPa·S), Metolose SM400 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 400 mPa·S), Metolose SM1500 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 1,500 mPa·S), and Metolose SM4000 (product name, Shin-Etsu Chemical Co., Ltd.) (viscosity in a 2% by weight aqueous solution at 20° C.: approximately 4,000 mPa·S).

Examples of carboxymethyl cellulose sodium (hereinafter sometimes referred to as CMCNa) include product names, Sunrose F-30MC [viscosity: 250-350 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-150MC [average molecular weight: 200,000, viscosity: 1,200-1,800 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-600MC [viscosity: 6,000-8,000 mPa·s (1% aqueous solution at 25° C.)], Sunrose F-1000MC [average molecular weight: 420,000, viscosity: 8,000-12,000 mPa·s (the same)], Sunrose F-1400MC [viscosity: 12,000-15,000 mPa·s (1% aqueous solution at 25° C.)], and Sunrose F-300MC [average molecular weight: 300,000, viscosity: 2,500-3,000 mPa·s (the same)] (Nippon Paper Chemicals Co., Ltd.).

Examples of hydroxyethyl cellulose (hereinafter sometimes referred to as HEC) include product names, HEC DAICEL SE850 [average molecular weight: 1,480,000, viscosity: 2,400-3,000 mPa·s (1% aqueous solution at 25° C.)], and HEC DAICEL SE900 [average molecular weight: 1,560,000, viscosity: 4,000-5,000 mPa·s (1% aqueous solution at 25° C.)] (Daicel chemical Industries, Ltd.).

Examples of carboxyvinyl polymers include Carbopol 71G (viscosity: 4,000-11,000 mPa·s), Carbopol 971P (viscosity: 4,000-11,000 mPa·s), Carbopol 981 (viscosity: 4,000-10,000 mPa·s), Carbopol 941 (viscosity: 4,000-10,000 mPa·s), Carbopol 934 (viscosity: 30,500-39,400 mPa·s), and Carbopol 934P (viscosity: 29,400-39,400 mPa·s) (B.F. Goodrich Chemical).

These hydrogel-forming polymers may be used alone, or as an appropriate combination of two or more thereof. A combination of different lots may be used.

The content of the hydrogel-forming polymer is not particularly limited, so long as it is an amount that, at the time of gelling, maintains the form against the motility of the digestive tract accompanied by food digestion, and migrates the gelled formulation to the colon in the lower digestive tract while maintaining the shape to a certain extent. The content of the hydrogel-forming polymer is 5% by weight to 70% by weight with respect to the total weight of the formulation, 10% by weight to 60% by weight in another embodiment, and 10% by weight to 40% by weight in still another embodiment.

A polymer of which the viscosity (before mixing) is beyond the specific range can be used as an appropriate combination with one or more other polymers, in case that the mixture obtained by mixing these plural polymers has a viscosity (as measured before the use) within the specific range.

In the additive which ensures penetration of water into the pharmaceutical composition of the present invention (hereinafter referred to as hydrophilic base), the amount of water necessary to dissolve 1 g of the hydrophilic base at 20±5° C. is 5 mL or less, and 4 mL or less in another embodiment. When the hydrophilic base has a high solubility to water, the effect that allows water to penetrate into the formulation is high.

Examples of the hydrophilic base include water-soluble polymers, such as polyethylene glycol [PEG: for example, product names PEG 400, PEG 1500, PEG 4000, PEG 6000, and PEG 20000 (NOF Corporation)], polyvinyl pyrrolidone (PVP: for example, product name PVP K30 (BASF), and the like; sugar alcohols, such as D-sorbitol, xylitol, and the like; saccharides, such as sucrose, anhydrous maltose, D-fructose, dextran (for example, Dextran 40), glucose, and the like; surfactants, such as polyoxyethylene hydrogenated castor oil [HCO: for example, Cremophor RH40 (BASF), HCO-40, HCO-60 (Nikko Chemicals)], polyoxyethylene polyoxypropylene glycol [for example, Pluronic F68 (Asahi Denka and the like)], polyoxyethylene sorbitan higher fatty acid esters [Tween: for example, Tween 80 (Kanto Chemical)], and the like; salts, such as sodium chloride, magnesium chloride, and the like; organic acids, such as citric acid, tartaric acid, and the like; amino acids, such as glycine, β-alanine, lysine hydrochloride, and the like; and aminosaccharides, such as meglumine and the like.

As another embodiment, PEG, PVP, polyoxyethylene polyoxypropylene glycol, or the like may be used.

These hydrophilic bases may be used alone, or as an appropriate combination of two or more thereof.

The content of the hydrophilic base is not particularly limited, so long as it is an amount capable of controlling the release of the drug to the extent that the release of the drug is not affected by food. The content of the hydrophilic base is, for example, 5% by weight to 70% by weight, and 20% by weight to 60% by weight in another embodiment.

The pharmaceutical composition for modified release of the present invention may be prepared as various dosage forms, which include, for example, formulations for oral administration such as tablets, capsules (including microcapsules), granules, and powder, and formulations for parenteral administration such as suppositories (for example, rectal suppositories or vaginal suppositories). These formulations may be safely administered orally or parenterally. Formulations for oral administration such as tablets, capsules, and granules may be selected in another embodiment.

The pharmaceutical composition for modified release of the present invention may be prepared by mixing the drug, the hydrophilic polymers, and the hydrophilic base, and forming the mixture into a predetermined shape. The mixing and forming may be carried out in accordance with conventional methods widely used in the technical field for formulation. A pharmaceutically acceptable carrier may be used in the mixing and/or forming, if desired.

Examples of pharmaceutically acceptable carriers include various organic or inorganic carrier substances which are widely used as formulation materials, such as fillers, lubricants, binders, and disintegrating agents. Other formulation additives such as preservatives, antioxidants, stabilizers, film coating agents, coloring agents, and sweeteners may be used, if desired.

Examples of the fillers include lactose, sucrose, D-mannitol, D-sorbitol, starch, gelatinized starch, dextrin, crystalline cellulose, low substituted hydroxypropyl cellulose, carboxymethyl cellulose sodium, gum arabic, dextrin, pullulan, light anhydrous silicic acid, synthetic aluminum silicate, magnesium aluminate metasilicate, and the like.

Examples of the lubricants include magnesium stearate, calcium stearate, talc, colloidal silica, and the like.

Examples of the binders include gelatinized starch, sucrose, gelatin, gum arabic, methylcellulose, carboxymethyl cellulose, carboxymethyl cellulose sodium, crystalline cellulose, sucrose, D-mannitol, trehalose, dextrin, pullulan, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polyvinylpyrrolidone, and the like.

Examples of the disintegrating agents include lactose, sucrose, starch, carboxymethyl cellulose, carboxymethyl cellulose calcium, croscarmellose sodium, carboxymethyl starch sodium, light anhydrous silicic acid, low substituted hydroxypropylcellulose, and the like.

Examples of the preservatives include p-hydroxybenzoate esters, chlorobutanol, benzyl alcohol, phenethyl alcohol, dehydroacetic acid, sorbic acid, and the like.

The antioxidants are not particularly limited, so long as it can avoid the effects of dissolution behavior. Examples of the antioxidants include butylated hydroxytoluene (BHT), propyl gallate (PG), butylhydroxyanisol (BHA), sodium ascorbate, erythorbic acid, sodium nitrite, sodium bisulfite, sodium pyrosulfite, citric acid, and edetate sodium; and BHT in another embodiment.

Examples of the stabilizers include yellow ferric oxide, red ferric oxide, black iron oxide, and the like.

Examples of the film coating agents include pharmaceutically commonly-used bases, such as water-soluble polymers, plasticizers, and inorganic substances, or a combination thereof.

Examples of the coloring agents include water-soluble edible tar pigments (examples: edible pigments such as food red No. 2, food red No. 3, food yellow No. 4, food yellow No. 5, food blue No. 1, and food blue No. 2), water-insoluble lake pigments (examples: aluminum salts of the above water-soluble edible tar pigments), natural pigments (examples: β-carotene, chlorophyll, and colcothar), and the like.

Examples of the sweeteners include saccharin sodium, dipotassium glycyrrhizinate, aspartame, stevia, and the like.

These carriers or formulation additives may be used alone, or as an appropriate combination of two or more thereof.

With respect to the contents thereof, they may be used in appropriate amounts. For example, the content of the antioxidant is 0.025% by weight to 0.25% by weight with respect to the total weight of the formulation, and that of the stabilizer is 0.05% by weight to 1% by weight with respect to the total weight of the formulation.

Hereinafter, the process of manufacturing the pharmaceutical composition for modified release of the present invention will be explained, the present invention is not limited to the following particular embodiments.

The pharmaceutical composition for modified release of the present invention may be prepared by known methods per se, such as dry granulation, wet granulation, fluidized bed granulation, intermittent granulation, agitation granulation, or the like.

As a method of de-lumping or pulverizing the drug, conventional crushing or pulverizing methods may be applied, for example, using an impact mill (Hosokawa Micron Corporation; Fine Impact Mill), a dry & wet mill (Powrex Corporation: Comil), or a cutting mill granulator (Dalton Corporation; Power Mill).

As a method of pulverizing the carrier or the formulation additives, conventional pulverizing methods may be applied, for example, using an impact mill (Hosokawa Micron Corporation; Fine Impact Mill or Sample Mill) or a jet mill (Horkos Corp; Jet Mill).

As a method of granulating the drug, conventional granulation methods may be used. Examples of such methods include a fluidized bed granulation method, an intermittent granulation method, an agitation granulation method, a high-speed agitation granulation method, a tumbling fluidized bed granulation method, an extrusion granulation method, a pulverization granulation method, a dry granulation method, and the like. In another embodiment, examples thereof include a fluidized bed granulation method, an intermittent granulation method, an agitation granulation method, a high-speed agitation granulation method, and a tumbling fluidized bed granulation method, and any method capable of granulating the drug may be used. Examples of a granulator include a fluidized bed granulator (for example, Flow Coater; Freund Corporation, or GPCG; Glatt GmbH), a granulation and coating apparatus equipped with a horizontal rotating disc having a flat powder contact portion [for example, a centrifugal fluidizing granulator (for example, CF granulator; Freund Corporation)], and a granulation and coating apparatus having a rotating disk with a flat surface placed at the bottom of a fluidized bed and having an aeration portion (for example, Spiralflow, or Flowcoater with a rotor container; Freund Corporation).

For example, while the drug, the hydrogel-forming polymer, the hydrophilic base, and additives such as a filler is fluidized, an appropriate amount of water or a liquid containing the hydrophilic base may be sprayed. The liquid containing the hydrophilic base may be prepared by dissolving or dispersing the essential component in a solvent such as water, ethanol, methanol, or the like. These solvents may be used as an appropriate mixture thereof.

The amount of water used in the granulation is not particularly limited, so long as the carrier or formulation additives (preferably, and the drug) may be uniformly dissolved and/or suspended (dispersed) in the water. When the hydrophilic base is used in the solid form, the amount of water is not particularly limited, so long as the hydrogel-forming base can be granulated.

When the hydrophilic base is used in the liquid form, the amount of water to the hydrogel-forming base is generally 10% by weight or less, 8% by weight or less in another embodiment, and 5% by weight or less in still another embodiment. A method of adding water in the granulation is not particularly limited, so long as a nonuniform mixture consisting of untreated powder and aggregates, which are generally powdery, is not generated. Examples thereof include a continuous spray method in which water is continuously added, an intermittent spray method in which a dry step (and a shaking step, if desired) is carried out during the granulation step, and the like.

The addition rate of water in the granulation is not particularly limited, so long as a nonuniform mixture consisting of untreated powder and aggregates, which are generally powdery, is not generated. In the fluidized bed granulation, the addition rate of water to the hydrogel-forming polymer is generally 0.1% by weight/min. to 1% by weight/min., 0.2% by weight/min. to 0.8% by weight/min. in another embodiment, and 0.4% by weight/min. to 0.6% by weight/min. in still another embodiment.

The temperature of the powder in the granulation is not particularly limited, so long as it does not induce thermal denaturation of the hydrogel-forming polymer. The temperature is, for example, 20° C. to the melting point (62° C. to 67° C.) of the hydrogel-forming polymer, 20° C. to 50° C. in another embodiment, 20° C. to 35° C. in still another embodiment, and 25° C. to 30° C. in still another embodiment.

The concentration of the polymer solution (the binder) is, for example, 1% to 20% as a formulation amount. The binder is not particularly limited, so long as it is pharmaceutically acceptable.

The binder may be added in the solid form to a granulator, and then, water may be sprayed as the binder liquid. Alternatively, the binder may be dissolved in water, and then, the resulting binder liquid may be sprayed.

An appropriate spray rate of the binder liquid varies according to a production method to be applied or its production scale. In a 1-kg scale production by the fluidized bed granulation, the spray rate is 2 g/min. to 20 g/min., and 5 g/min. to 15 g/min. in another embodiment.

An appropriate temperature of the product in the granulation is 15° C. to 50° C., and 15° C. to 40° C. in another embodiment.

The resulting granulated products may be, for example, dried or heated.

In the drying step, an apparatus and a method are not particularly limited, so long as the granulated products can be dried. Examples of an apparatus for drying include a fluidized bed granulator (for example, Flow Coater; Freund Corporation, or GPCG; Glatt GmbH), a granulation and coating apparatus equipped with a horizontal rotating disc having a flat powder contact portion [for example, a centrifugal fluidizing granulator (for example, CF granulator; Freund Corporation)], a granulation and coating apparatus having a rotating disk with a flat surface placed at the bottom of a fluidized bed and having an aeration portion (for example, Spiralflow, or Flowcoater with a rotor container; Freund Corporation), and the like. The conditions for drying are not particularly limited, so long as the granulated products may be generally dried in the fluidized bed. The drying of the granulated products will be almost completed, for example, under the conditions in which the dry inlet air temperature is 50° C. and the drying is carried out until the temperature of the granulated products becomes 40° C. As the drying method, forced-air drying or drying under reduced pressure may be used.

After the completion of the granulation, an anti-oxidant may be added.

Examples of tabletting include a direct tabletting method in which the drug is mixed with an appropriate additive(s), and the mixture is compression-molded to obtain tablets; a method in which a composition obtained by a wet granulation (the granulation is carried out by spraying a mixture of the drug-containing particles and additives with a binder liquid) or a melting granulation (the granulation is carried out by heating a mixture of the drug-containing particles and an appropriate low-melting substance) is formed into tablets; and the like.

A rotary tabletting machine, a single punch tabletting machine, and the like may be used as a tabletting machine. A method as well as an apparatus is not particularly limited, so long as a compression-molded product (preferably tablets) can be pharmaceutically produced.

After the tabletting, the obtained tablets may be dried. The initial water content of the tablet is, for example, 2% by weight/tablet or less, 1.5% by weight/tablet or less in another embodiment, and 0.9% by weight/tablet or less in still another embodiment.

After the tabletting, the obtained tablets may be film coated using a pan coating machine at an amount of 1% by weight to 5% by weight per tablet.

Examples

The present invention will now be further illustrated by, but is by no means limited to, the following Examples.

Example 1

In a mortar, 10 g of compound A hydrochloride, 2.5 g of polyethylene oxide (Dow chemical; product name: WSR-N-60K; The same compound was used in the following Examples.), and 7.5 g of polyethylene glycol (Sanyo Chemical Industries, Ltd.; PEG 6000; The same compound was used in the following Examples.) were mixed well. The mixture was formed into tablets using Autograph (Shimadzu; The same apparatus was used in the following Examples.) to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 400 mg.

Example 2

In a mortar, 10 g of compound A hydrochloride, 3.5 g of polyethylene oxide, and 6.5 g of polyethylene glycol were mixed well, and the mixture was formed into tablets using Autograph to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 400 mg.

Example 3

In a mortar, 10 g of compound A hydrochloride, 6.25 g of polyethylene oxide, and 5 g of polyethylene glycol were mixed well, and the mixture was formed into tablets using Autograph to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 425 mg.

Example 4

In a mortar, 10 g of compound A hydrochloride, 5 g of hydroxypropyl methylcellulose (Shin-Etsu Chemical Co., Ltd.; HPMC90SH-4000SR), and 5 g of polyethylene glycol were mixed well, and the mixture was formed into tablets using Autograph to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 400 mg.

Example 5

In a mortar, 10 g of compound A hydrochloride, 5 g of hydroxypropyl methylcellulose (Shin-Etsu Chemical Co., Ltd.; HPMC90SH-10000SR), and 5 g of polyethylene glycol were mixed well, and the mixture was formed into tablets using Autograph to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 400 mg.

Example 6

In a mortar, 10 g of compound A hydrochloride, 7.5 g of hydroxypropyl cellulose (Shin-Etsu Chemical Co., Ltd.; HPMC90SH-100SR), and 2.5 g of polyethylene glycol were mixed well, and the mixture was formed into tablets using Autograph to obtain a pharmaceutical composition for modified release of the present invention having a tablet weight of 400 mg.

Example 7

After 400 g of compound A hydrochloride, 140 g of polyethylene oxide, 251.2 g of polyethylene glycol, 0.8 g of finely ground BHT (Merck; The same compound was used in the following Examples.) and 8 g of magnesium stearate were weighed out, these compounds were mixed using a mixer. The mixture was compression-molded using Roller Compactor Mini (Freund Corporation) and sieved to obtain a pharmaceutical composition for modified release (granules) of the present invention. The obtained granules were formed into tablets using a rotary tabletting machine (Hata Iron Works Co., Ltd.; The same apparatus was used in the following Examples.) to obtain a pharmaceutical composition for modified release (tablets) of the present invention having a tablet weight of 400 mg.

Example 8

The tablets obtained in Example 7 were coated with a film coating agent [Colorcon; Opadry; The same agent was used in the following Examples.] dispersed into water to obtain a pharmaceutical composition for modified release (tablets) of the present invention.

Example 9

Into a fluidized bed granulating apparatus GPCG-5 (Freund Corporation; The same apparatus was used in the following Examples.), 1500 g of de-lumped compound A hydrochloride, 1050 g of polyethylene oxide, and 1764 g of polyethylene glycol were loaded, and granulated with 1350 g of a 10% by weight aqueous solution of hydroxypropyl cellulose (Nippon Soda Co., Ltd.; HPC-SL; The same compound was used in the following Examples.) to obtain a pharmaceutical composition for modified release (granules) of the present invention. The resulting pharmaceutical composition for modified release (granules) of the present invention was sieved and mixed with 4 g of finely ground BHT and 30 g of magnesium stearate, and the mixture was formed into tablets using a rotary tabletting machine to obtain tablets having a tablet weight of 300 mg. The obtained tablets were spray-coated with an aqueous dispersion of the film coating agent using HiCoater to obtain a pharmaceutical composition for modified release (tablets) of the present invention having a tablet weight of 309 mg.

Example 10

Into a fluidized bed granulating apparatus GPCG-5, 1500 g of de-lumped compound A hydrochloride, 1050 g of polyethylene oxide, 1764 g of polyethylene glycol, and 135 g of hydroxypropyl cellulose (HPC-SL) were loaded, and granulated with purified water to obtain a pharmaceutical composition for modified release (granules) of the present invention. The resulting pharmaceutical composition for modified release (granules) of the present invention was sieved and mixed with 4 g of finely ground BHT and 30 g of magnesium stearate, and the mixture was formed into tablets using a rotary tabletting machine to obtain tablets having a tablet weight of 300 mg. The obtained tablets were spray-coated with an aqueous dispersion of the film coating agent using HiCoater to obtain a pharmaceutical composition for modified release (tablets) of the present invention having a tablet weight of 309 mg.

Example 11

After 400 g of compound A hydrochloride, 100 g of polyethylene oxide, 290 g of polyethylene glycol, 2 g of finely ground BHT, and 8 g of magnesium stearate were weighed out, these compounds were mixed using a mixer. The, mixture was compression-molded using Roller Compactor Mini and sieved to obtain a pharmaceutical composition for modified release (granules) of the present invention. The obtained granules were formed into tablets using a rotary tabletting machine to obtain a pharmaceutical composition for modified release (tablets) of the present invention having a tablet weight of 400 mg.

The formulations in Examples 1 to 11 are shown in Tables 1 to 2.

TABLE 1 Examples 1 2 3 4 5 6 compound A (g) 10   10   10  10  10  10   PEO (g) 2.5 3.5   6.25 — — — HPMC 90SH-4000SR (g) — — — 5 — — HPMC 90SH-10000SR (g) — — — — 5 — HPMC 90SH-100SR (g) — — — — — 7.5 PEG (g) 7.5 6.5 5 5 5 2.5

TABLE 2 Examples 7 8 9 10 11 compound A (g) 400 400 1500 1500 400 PEO (g) 140 140 1050 1050 100 PEG (g) 251.2 251.2 1764 1764 290 HPC-SL (g) — — 135 135 — magnesium stearate (g) 8 8 30 30 8 BHT (g) 0.8 0.8 4 4 2 film coating agent (g) — 23.7 134 134 —

Comparative Example 1

After 400 g of pulverized compound A hydrochloride was mixed with 1200 g of D-mannitol, 320 g of purified water was further added, and the whole was kneaded using an agitation granulator (Powrex Corporation; VG-25). The resulting aggregate was sieved through a screen having an opening of 850 μm, and dried using a fluidized bed granulating apparatus (Freund Corporation; FLO-1). The dried products were sieved through a screen having an opening of 500 μm, and filled into No. 1 capsules at a content of 320 mg per capsule to obtain 80 mg capsules.

Experimental Examples 1. Dissolution Test

The pharmaceutical compositions prepared in Examples 2, 8, and 9 were subjected to a dissolution test carried out in accordance with a USP dissolution test (paddle method). As a test fluid, 900 mL of a phosphate buffer (pH 6.8) was used. The pharmaceutical composition prepared in Comparative Example 1 was tested in accordance with a dissolution test, method 2 described in the Japanese Pharmacopoeia. As a test fluid, 900 mL of a Mc. Ilvain buffer (pH 6.8) was used, and the paddle rotation speed was 50 rpm.

The results are shown in Table 3. The dissolution rate after 1.5 hours of the pharmaceutical composition for modified release prepared in each Example was less than 40%. By contrast, the composition prepared in Comparative Example showed a high dissolution rate of 85% or more after 0.5 hour.

TABLE 3 Exam- Comparative ple 2 Example 8 Example 9 Example 1 0.5 hr. — — — 95% 1.5 hr. 35% 39% 32% — 2.5 hr. 57% 61% 54% — 4.5 hr. 93% 95% 92% —

2. Stability Test

Plastic bottles were filled with the pharmaceutical composition for modified release prepared in Example 11, and sealed. These bottles were preserved under the conditions at 40° C. and 75% RH or at 60° C. for 3 months. After the preservation, each pharmaceutical composition was subjected to a dissolution test carried out in accordance with a USP dissolution test (paddle method). As a test fluid, 900 mL of a phosphate buffer (pH 6.8) was used. The results are shown in FIG. 1. The acceleration of a dissolution rate was not observed after the preservation for 3 months under the conditions at 40° C. and 75% RH or at 60° C., and the results were indicative that the pharmaceutical composition was stable.

3. Pharmacokinetics (PK) Test in Human

The pharmaceutical composition for modified release prepared in Example 2, which contained the equivalent corresponding to 200 mg of compound A hydrochloride, was administered to healthy persons in a fasted state or after 30 minutes from the intake of food, and the plasma levels of the drug were measured.

For comparison, 2 capsules of the pharmaceutical composition (conventional formulation) prepared in Comparative Example 1, which contained the equivalent corresponding to 160 mg of compound A hydrochloride, was administered to healthy persons in a fasted state or after 30 minutes from the intake of food, and the plasma levels of the drug were measured.

With respect to the conventional formulation, Cmax in the fed state was decreased to 33%, in comparison with that in a fasted state, and AUC was decreased to 53% (Cmax in the fasted state was approximately three times higher than that in the fed state). With respect to the pharmaceutical composition for modified release of the present invention, Cmax in free-feeding was 58%, in comparison with that in a fasted state, and AUC was 75%. These results indicated that the reductions of Cmax and AUC caused by food intake could be significantly alleviated by the pharmaceutical composition for modified release of the present invention.

INDUSTRIAL APPLICABILITY

According to the present invention, a pharmaceutical composition for modified release in which the changes in AUC and Cmax caused by food intake can be decreased by controlling a releasing rate of the active ingredient can be provided. 

1. A pharmaceutical composition for modified release, comprising (1) (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide, or a pharmaceutically acceptable salt thereof, (2) at least one additive which ensures penetration of water into the pharmaceutical composition and which has a solubility such that the volume of water required for dissolving 1 g of the additive is 10 mL or less, and (3) a hydrogel-forming polymer having an average molecular weight of approximately 100,000 or more, or a viscosity of 12 mPa·s or more at a 5% aqueous solution at 25° C.
 2. The pharmaceutical composition for modified release according to claim 1, wherein the additive which ensures penetration of water into the pharmaceutical composition is one compound, or two or more compounds selected from the group consisting of polyethylene glycol, polyvinylpyrrolidone, D-mannitol, D-sorbitol, xylitol, lactose, sucrose, anhydrous maltose, D-fructose, dextran, glucose, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene glycol, polyoxyethylene sorbitan higher fatty acid ester, sodium chloride, magnesium chloride, citric acid, tartaric acid, glycine, β-alanine, lysine hydrochloride, and meglumine.
 3. The pharmaceutical composition for modified release according to claim 2, wherein the additive which ensures penetration of water into the pharmaceutical composition is one compound, or two or more compounds selected from the group consisting of polyethylene glycol, polyvinylpyrrolidone, D-mannitol, lactose, sucrose, sodium chloride, and polyoxyethylene polyoxypropylene glycol.
 4. The pharmaceutical composition for modified release according to claim 1, wherein an amount of the additive which ensures penetration of water into the pharmaceutical composition is 5% by weight to 75% by weight with respect to the total weight of the pharmaceutical composition.
 5. The pharmaceutical composition for modified release according to claim 4, wherein an amount of the additive which ensures penetration of water into the pharmaceutical composition is 5% by weight to 70% by weight with respect to the total weight of the pharmaceutical composition.
 6. The pharmaceutical composition for modified release according to claim 1, wherein the hydrogel-forming polymer is one compound, or two or more compounds selected from the group consisting of polyethylene oxide, hydoxypropyl methylcellulose, hydroxypropyl cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose, and a carboxyvinyl polymer.
 7. The pharmaceutical composition for modified release according to claim 6, wherein the hydrogel-forming polymer is one compound, or two or more compounds selected from the group consisting of polyethylene oxide, hydoxypropyl methylcellulose, and hydroxypropyl cellulose.
 8. The pharmaceutical composition for modified release according to claim 1, wherein an amount of the hydrogel-forming polymer is 1% by weight to 70% by weight with respect to the total weight of the pharmaceutical composition.
 9. The pharmaceutical composition for modified release according to claim 1, further comprising an antioxidant.
 10. The pharmaceutical composition for modified release according to claim 9, wherein the antioxidant is one compound, or two or more compounds selected from the group consisting of butyl hydroxytoluene, propyl gallate, and sodium ascorbate.
 11. The pharmaceutical composition for modified release according to claim 10, wherein the antioxidant is butyl hydroxytoluene.
 12. The pharmaceutical composition for modified release according to claim 9, wherein an amount of the antioxidant is 0.025% by weight to 0.25% by weight.
 13. The pharmaceutical composition for modified release according to claim 1, further comprising a stabilizer.
 14. The pharmaceutical composition for modified release according to claim 13, wherein the stabilizer is one compound, or two or more compounds selected from the group consisting of yellow ferric oxide, red ferric oxide, and black iron oxide.
 15. The pharmaceutical composition for modified release according to claim 14, wherein the stabilizer is yellow ferric oxide and/or red ferric oxide.
 16. The pharmaceutical composition for modified release according to claim 13, wherein an amount of the stabilizer is 0.05% by weight to 1% by weight.
 17. A process of manufacturing a pharmaceutical composition for modified release, characterized by comprising mixing (1) (R)-2-(2-aminothiazol-4-yl)-4′-[2-[(2-hydroxy-2-phenylethyl)amino]ethyl]acetic acid anilide, or a pharmaceutically acceptable salt thereof with (2) at least one additive which ensures penetration of water into the pharmaceutical composition and which has a solubility such that the volume of water required for dissolving 1 g of the additive is 10 mL or less and (3) a hydrogel-forming polymer having an average molecular weight of approximately 100,000 or more, or a viscosity of 12 mPa·s or more at a 5% aqueous solution at 25° C., wherein an amount of the additive is 5% by weight to 75% by weight with respect to the total weight of the pharmaceutical composition, and an amount of the hydrogel-forming polymer is 1% by weight to 70% by weight with respect to the total weight of the pharmaceutical composition.
 18. The process according to claim 17, wherein the additive which ensures penetration of water into the pharmaceutical composition is one compound, or two or more compounds selected from the group consisting of polyethylene glycol, polyvinylpyrrolidone, D-mannitol, D-sorbitol, xylitol, lactose, sucrose, anhydrous maltose, D-fructose, dextran, glucose, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene glycol, polyoxyethylene sorbitan higher fatty acid ester, sodium chloride, magnesium chloride, citric acid, tartaric acid, glycine, β-alanine, lysine hydrochloride, and meglumine.
 19. The process according to claim 17, wherein the hydrogel-forming polymer is one compound, or two or more compounds selected from the group consisting of polyethylene oxide, hydoxypropyl methylcellulose, hydroxypropyl cellulose, carboxymethyl cellulose sodium, hydroxyethyl cellulose, and a carboxyvinyl polymer. 